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Progresión is a term that can refer to several concepts, most commonly in mathematics. In arithmetic progression, a sequence of numbers is established where the difference between consecutive terms is constant. For example, 2, 4, 6, 8 is an arithmetic progression with a common difference of 2. The formula for the nth term of an arithmetic progression is a_n = a_1 + (n-1)d, where a_1 is the first term and d is the common difference.

Geometric progression, another type of sequence, involves a constant ratio between consecutive terms. An example is 3, 9, 27, 81, where each term is obtained by multiplying the previous term by 3. The formula for the nth term of a geometric progression is a_n = a_1 * r^(n-1), where a_1 is the first term and r is the common ratio.

Beyond mathematical sequences, "progression" can also describe a general advance or development over time. This could apply to societal changes, technological advancements, or even the stages of a disease. The concept implies movement forward, often towards a more complex or developed state, though the connotation can be neutral or positive depending on the context. In music, a progression refers to a series of chords. In a broader sense, progression signifies a continuous movement or development.